研究目的
Investigating the electron temperature in cascaded arc Ar/N2 plasma using laser Thomson scattering combined with optical emission spectroscopy approach to understand the deviation from local thermodynamic equilibrium.
研究成果
The study demonstrated a nonlinear behavior of electron temperature as a function of N2 concentration, attributed to the interaction between superelastic collision and electron-impact excitation. The significant deviation between Texc and Te indicates that the plasma is not in local thermodynamic equilibrium, providing insights into nonequilibrium plasma behavior.
研究不足
The study is limited to the specific conditions of cascaded arc Ar/N2 plasma and may not be directly applicable to other plasma types or conditions. The accuracy of measurements could be affected by the sensitivity of the equipment and the complexity of plasma interactions.
1：Experimental Design and Method Selection:
The study employed laser Thomson scattering (LTS) and optical emission spectroscopy (OES) to measure electron temperature (Te) and electron excitation temperature (Texc), respectively.
2：Sample Selection and Data Sources:
The plasma was generated in a cascaded arc plasma source with Ar and N2 gases, adjusting the N2 gas mass flow rate from 0% to 10%.
3：0%. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 10 ns pulsed Nd:YAG laser, a homemade Triple Grating Spectrometer (TGS), and a high quantum efficiency iCCD camera were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused into the detection volume, and the scattering light was collected and analyzed.
5：Data Analysis Methods:
The Thomson scattering spectra were obtained by integrating multiple laser pulses, and the OES light was dispersed by a spectrometer for analysis.
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